package 常用api;

import java.util.Map;
import java.util.StringJoiner;

import static java.lang.System.currentTimeMillis;

public class stringjoiner {
    public static void main(String[] args) {
        String[] strarr = {"a", "b", "c"};
        System.out.println(new StringJoiner(",","[","]").add("a").add("b").add("c"));
        System.out.println(currentTimeMillis()/1000/60/60/24/365);
    }
}
